Davis County Soil Data
Davis County, Iowa
Avg pH
6.2
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.4%
Hydrologic Group
N/A
Data Story
About Soil in Davis County, Iowa
Acidic Tones in Southern Iowa Soil
Davis County's soil carries an average pH of 6.15, making it more acidic than both the national median of 6.5 and the state average of 6.43. This lower pH suggests that lime treatments may be necessary for certain sensitive crops. Though taxonomic data is not specified, the chemical signature points to a unique southern Iowa profile.
A Silty Foundation with High Silt Content
The soil composition is dominated by silt at 54.1%, paired with 24.9% clay and 21.0% sand. This high silt-to-sand ratio creates a fine-textured soil that holds onto nutrients but can be prone to erosion if left uncovered. The clay content provides enough body to retain moisture during drier spells.
High Water Retention Despite Lower Organic Matter
Organic matter in Davis County averages 2.43%, which is higher than the national 2.0% average but significantly lower than the Iowa average of 3.81%. Interestingly, its available water capacity of 0.197 in/in actually beats the state average. This means the soil is exceptionally good at storing every drop of rain for your plants.
Managing Water in Fine-Textured Earth
The high silt and clay levels suggest the soil may drain slowly, supported by a water capacity that exceeds the state benchmark of 0.195. While specific hydrologic groups are not listed, the density of this soil profile requires careful irrigation management. These traits help explain the county's soil score of 65.2.
Southern Iowa Gardening in Zone 5b
Davis County gardeners in Zone 5b can find great success with acid-loving plants like blueberries or potatoes. The high water capacity is a major asset for maintaining a lush garden through the peak of summer. Use organic mulch to help boost the lower organic matter levels and watch your harvest thrive.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Hydrologic group data not available.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Silt Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Davis County have?
Davis County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 21% sand, 54% silt, and 25% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Davis County's soil acidic or alkaline?
Davis County's soil has a pH of 6.2, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Davis County?
Drainage class data is not currently available for Davis County.
What crops or plants grow well in Davis County's soil?
Based on Davis County's Silt Loam texture, pH of 6.2, and drainage class, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens.
What USDA soil order is found in Davis County?
The dominant USDA soil order for Davis County is not currently available in our dataset.
Planning your lawn? View lawn care data for Davis County on LawnByCounty.com →
Other Counties in Iowa
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.